The in vivo effect of fibrinogen and factor XIII on clot formation and fibrinolysis in Glanzmann's thrombasthenia.

Abstract:

:Glanzmann's thrombasthenia (GT) is characterized by increased bleeding risk. The treatment options in GT are limited. The aim of this study was to test the effect of GT blood supplementation with fibrinogen and factor XIII on thrombin generation, blood clotting, and fibrinolysis. Whole blood samples of GT patients and normal donors treated with eptifibatide (GT model) were subjected to clotting by CaCl(2) and tissue factor. Thrombin generation was measured in platelet-rich plasma. Clot formation and tPA-induced fibrinolysis were evaluated in whole blood by rotation thromboelastometry (ROTEM). Blood was supplemented with fibrinogen (3 g/L) and/or FXIII (2 IU/mL). Thrombin generation analysis of blood derived from GT model and GT patients revealed decreased endogenous thrombin potential and peak height and extended lag time compared to control. However, this method was not sensitive to blood spiking with fibrinogen and FXIII. ROTEM revealed lower maximum clot firmness (MCF) and area under curve (AUC) in the blood of GT model and GT patients. In the absence of exogenous tPA, blood spiking with fibrinogen markedly enhanced clot quality while FXIII had no effect. Combination of fibrinogen and FXIII did not add to the effect of fibrinogen. In contrast, by the addition of tPA, both fibrinogen and FXIII separately and, to more extent, in combination enhanced clot quality as well as resistance against tPA-induced fibrinolysis (increasing MCF, AUC, and lysis onset time). In conclusion, fibrinogen and FXIII exerted stimulation of blood clotting and inhibition of fibrinolysis. Treating normal blood with eptifibatide mimics the changes of coagulopathy in GT blood.

journal_name

Platelets

journal_title

Platelets

authors

Shenkman B,Livnat T,Misgav M,Budnik I,Einav Y,Martinowitz U

doi

10.3109/09537104.2011.642031

subject

Has Abstract

pub_date

2012-01-01 00:00:00

pages

604-10

issue

8

eissn

0953-7104

issn

1369-1635

journal_volume

23

pub_type

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